 The M1008 was the basic cargo truck, the M1010 was the ambulance, and the M1009 was a Chevrolet K5 Blazer uprated to ¾-ton capacity.With the exception of the M1009, the trucks were all rated as 1 ton (commonly called a "five-quarter"), even though some of them had payloads in excess of that.There were heavier-duty variants, including the M1028, M1028A1, M1028A2 and M1028A3 shelter carriers (the shelter being a mobile command, communications or intelligence operations enclosure).